3/4x-1/6x=7

Solution for 3/4x-1/6x=7 equation:

3/4x-1/6x=7

We move all terms to the left:

3/4x-1/6x-(7)=0


Domain of the equation: 4x!=0

x!=0/4

x!=0

x∈R



Domain of the equation: 6x!=0

x!=0/6

x!=0

x∈R


We calculate fractions


18x/24x^2+(-4x)/24x^2-7=0

We multiply all the terms by the denominator


18x+(-4x)-7*24x^2=0

Wy multiply elements

-168x^2+18x+(-4x)=0

We get rid of parentheses

-168x^2+18x-4x=0

We add all the numbers together, and all the variables

-168x^2+14x=0

a = -168; b = 14; c = 0;
Δ = b2-4ac
Δ = 142-4·(-168)·0
Δ = 196
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{196}=14$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(14)-14}{2*-168}=\frac{-28}{-336}
=1/12
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(14)+14}{2*-168}=\frac{0}{-336}
=0
$